According to Facebook(s fb), police and other agencies in the US asked for user data on more than 11,000 occasions during the first half of 2013, a number that included more than 20,000 individual Facebook users.

The numbers come by way of the social network’s first Transparency Report, a document that also lists figures for other countries around the world, though U.S. requests are by far the highest. Facebook did not hand over information in every case.

The 11,000 US data requests are more than the approximately 8,000 requests received by Google(s goog) for a similar time frame. According to Facebook, many of the requests were for criminal matters like robbery and kidnappings.

The social network, however, did not offer more insight into the source of the requests — and, in particular, did not specify how many were related to the federal government’s controversial program of national security letters…